SimpleMail - A new mailer for the Amiga platform (both clients classic and clients OS4) and compatible systems (MorphOS).

OpenSmtp.Net - An SMTP component written in C#. Allows developers to use SMTP servers other than MS SMTP and has a web service that allows the sending of email via HTTP/SOAP. [BSD License.] Windows only.

Mozilla Mail/News - Technical information and project documentation of the integrated email and internet news client in the Mozilla Suite.